Internal-combustion engine



Oct. 28, 1930. I w. HEYDEMANN 1,779,596

INTERNAL COMBUSTION ENGINE Filed OCL. 3l, 1928 Fly. 4. Fig. 3.

N1 I 31 N K M2 1? M E W an U I E H B B n 5 F a F Patented Oct. 28, 1930UNITED STATES PATENT OFFICE WOLFGANG HEYDEMANN, OF KIEL-DIETRICHSDORF,GERMANY, ASSIGNOR TO FRIED. KRUPP GERMANIAWERFT AKTIENGESELLSCHAIT, 0FKIEL-GAARDEN, PRUSSIA,

GERMANY Application filed October 31, 1928, Serial No. 316,286, and inGermany November 21, 1927.

The invention relates to vertical two stroke cycle internal combustionengines, in particular multi-cylinder marine Diesel engines of highpower, in which the cylinders of the scavenging pumps are arrangedimmediately beside the working cylinders, in order to simplify the driveof the scavenging pumps. In known engines of this type the suction andpressure valves of the scavenging pumps have vertical axes and arearranged round the scavenging pumps in concentric superimposed series.This arrangement sufiers however from the drawback that the upperportion of the engine projects considerably in lateral direction beyondthe base plate, because the working cylinder, the scavenging pumps, andtheir valve heads are located side by side, see Figures 1 and 2 of thedrawing. The resulting great width of the upper portion of the engine isparticularly troublesome with marine engines, as cabin gangways extendabout at the level of the cylinders and the space required for theformer is restricted by the cylinders.

The invention has for its object a two stroke cycle internal combustionengine of the above-mentioned type that is free from the drawback setforth above. According to the invention the axes of the suction andpressure valves for the scavenging pumps extend horizontally and thesevalves are arranged on both sides of the scavenging pumps.

The subject-matter of the invention is illustrated by way of example inthe accompanying drawing, in which Figures 1 and 2 show in verticallongitudinal section and in top view, respectively, a two stroke cycleinternal combustion engine fitted with a valve arrangement of knowndesign, whilst Figures 3 and 4 illustrate in a similar manner an engineof the same construction but having the scavenging pump valves arrangedaccording to the invention.

Referring to these figures, A denotes a working cylinder of amulticylinder marine Diesel engine which cylinder rests on the columns BB The piston C reciprocating in the cylinder A transmits its motion bythe piston rod D to the cross head E and from there by the rod F to thecrank G of the engine shaft. Immediately beside each workmg cylinder isarranged the corresponding scavenging pump cylinder H the piston K ofwhich is actuated through the intermediary of the piston rod L by an armP. fixed on the cross head E of the engine. The scavenging pump is adouble-acting one. The air is sucked in from the outside during thedownward stroke by the suction valves M and during the upward stroke bythe suction valves M In the first case it passes into the compressed airchamber h through the pressure valves N and in the latter case throughthe pressure valves N from which chamber it passes through thescavenging ports a immediately connected thereto, of the workingcylinder. Figures 3 and 4 show the new arrangement of the valves on bothsides of the pump cylinders, the axes of the valves extendinghorizontally.

As may be seen by comparing the two arrangements illustrated in Figures1, 2 and 3, 4, the arrangement according to the invention makes possiblea considerably narrower construction of the upper portion of the enine.

The lateral arrangement of the valves beside the pump cylinders afiordsthe further advantage of more total space being at disposal for thesevalves, so that greater valve sections can be located in the upperportion of the engine without increasing its structural width, wherebythe number of the valves to be provided may be reduced.

What I claim and desire to secure by Letters Patent is 2-- A verticaltwo stroke cycle internal combustion engine having scavenging pumps withcylinders arranged immediately beside the corresponding workingcylinders, the suction and pressure valves of said pumps being arrangedon both sides of each corresponding pump cylinder, and between said pumpcylinders, and having horizontal axes.

The foregoing specification signed at Hamburg, Germany, this eleventhday of October, 1928.

WOLFGANG HEYDEMANN.

